Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfdb4938378e66e1…

MALICIOUS

PDF

76.1 KB Created: 2021-03-18 20:23:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef9794d8e6f2dd91c6c130cae026ec03 SHA-1: 159045a4b1c2f6dec1af2571b78a2d39730e9194 SHA-256: cfdb4938378e66e17b75ff409328cc669c04d22e81546daba50852e241146577
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified as a link farm, with one URL specifically pointing to a keyword-based search result for 'appvn hack apk download'. This suggests a phishing or scam attempt to direct users to download potentially malicious applications. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vilenefex.ru/wix?keyword=appvn+hack+apk+download
    • https://static.s123-cdn-static.com/uploads/4371013/normal_5fff0d9890489.pdf
    • https://static.s123-cdn-static.com/uploads/4420029/normal_5ff86546b9542.pdf
    • https://static.s123-cdn-static.com/uploads/4427287/normal_5fe2358e5eafc.pdf
    • https://noduxulab.weebly.com/uploads/1/3/4/9/134901810/8574280.pdf
    • https://cdn-cms.f-static.net/uploads/4409630/normal_60238cdf49a8b.pdf
    • https://cdn-cms.f-static.net/uploads/4365546/normal_6015ccce7e38e.pdf
    • https://static.s123-cdn-static.com/uploads/4499660/normal_5ff23c452dfc1.pdf
    • https://cdn-cms.f-static.net/uploads/4370791/normal_603a0899a9405.pdf
    • https://cdn-cms.f-static.net/uploads/4423195/normal_604c9ff9ba45d.pdf
    • https://xugugizebe.weebly.com/uploads/1/3/1/4/131482894/6939452.pdf
    • https://lisiruzefixa.weebly.com/uploads/1/3/4/4/134495270/neranasorekudiw_lotufidakifagas_devusojexisa_vibizelax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_1c802bb88d48429ea1f0ab0db87c0644.pdf?index=true
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_3a4bb2ab5c114e58affceb7afcea8bc8.pdf?index=true
    • https://s3.amazonaws.com/pulujolatepuv/how_to_make_someone_fall_in_love_with_you_walter_bower.pdf
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_4866815740214174a06c91310c3ddd20.pdf?index=true
    • https://s3.amazonaws.com/gofilafixu/zemexifawigafuwuj.pdf
    • https://s3.amazonaws.com/wumodukubaru/adblock_for_android_box.pdf
    • https://755d026c-fd58-4633-9ca9-8af24261f473.filesusr.com/ugd/4622eb_20640438da7a47549721ee96505227a6.pdf?index=true
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_d3f6b14a635644cdb166fa83dd7488ff.pdf?index=true
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_3dd64cb74ec74bd0b8072dc5cccba3b3.pdf?index=true
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_3e2c6d2b123b42bf8b0243b82e3c9dda.pdf?index=true
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_371a5e8ecfba4a55a92c2a4a3d3f6824.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec9a.bin
db4ec98c43b6a06f45abae7942b5fc72ce5c690c4664a9c52d3921457466a731		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9A 5092 bytes
font_01_sfnt_off0000fdff.bin
95c1ec7dd5c2a8b9aa275c62dd631a506c11ba343d8a9eb19db1810bcfb19723		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFF 10608 bytes

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